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Mines

Wednesday, November 23, 2022 – morning

Session 3: Geoscientific knowledge acquisition work by the MERN and its university partners – Grenville Province

Chair and session organizer

François Leclerc

MERN

Co-chair

Hugo Dubé-Loubert

MERN

This session will be offered in French.

Géologie Québec unveils the preliminary results of its most recent geoscientific knowledge acquisition surveys. The Bulletins géologiQUEs, including new interpretations, new mineralized zones and prospective elements for mining exploration, will be presented for the geological surveys of the Ungava (Amarurtuuq), James Bay (Cadet Lake, Lac de la Marée), Abitibi (Alouettes Lake, Dickson Lake) and Grenville (Bellemare, Lac de la Fourche, Île-du-Grand-Calumet). New geochemical data from lake bottom sediments in the Eastmain River area will also be presented.

9:00 a.m.

Welcome from the Chair

9:05 a.m.

New geophysical surveys published in 2021-2022.

Conference details

Authors: Rachid Intissar (MERN) and Julie Vallières (MERN)

9:20 a.m.

New geophysical surveys published in 2021-2022.

Conference details

Authors: Abdelali Moukhsil (MERN), Mhamed El Bourki (MERN)

In the summer of 2021, the areas north of Dolbeau-Mistassini (NTS sheet 32H01), Girardville and Blondelas Lake (sheet 32H07), in the Saguenay-Lac-Saint-Jean region, were geologically mapped at the 1:50 000 scale. The mapped rocks are Mesoproterozoic to Neoproterozoic in age (1.484 to 0.958 Ga) and were emplaced in the Grenville Province Allochthon. Located in the eastern part of sheet 32H01, the Lac-Saint-Jean Anorthositic Suite (1169 to 1135 Ma) is the largest unit. The rocks of this suite are injected with rocks belonging to other intrusions such as: the Batholite de l'Écluse (granite, syenite, gabbronorite, leuconorite); the Rivière Noire Intrusion, ultramafic in composition and enriched in rare earth elements (REE) ± P; and the Saint-Hedwidge Intrusive Suite (1017.6 ±36 Ma, granite, syenite, mangerite, gabbronorite). Other Mesoproterozoic intrusive rocks in the area are: the Vertu, Grondin, Adélard, and Festins plutonic suites; the Coin and Long batholiths; the Jean-Marie intrusive suite; and the Tommy Pluton. Supracrustal rocks have also been mapped in the area, including: the St-Onge Supracrustal Sequence (>1160 Ma, quartzofeldspathic paragneiss, ± wollastonite marble, calc-silicate rocks, quartzite, metavolcanic rocks); the Barrois Complex (<1224 ±18 Ma, volcano-sedimentary rocks). Sporadic granitic to syenitic pegmatite dykes and a few carbonatite dykes occur in the area. The Neoproterozoic (957.5 ±2.9 Ma) alkaline Crevier Intrusion (CCI), recognized in the northern part of sheet 32H07, is composed of nepheline syenite, carbonatite and megacrystalline albite, nepheline and pyrochlore dykes. Previous exploration work has demonstrated its economic potential in Nb-Ta.

The Mesoproterozoic rocks are generally deformed and cut by several faults and shear zones. The regional structural grain is predominantly SW-NE and SE-NW trending, accommodating the final emplacement of the intrusions. The SE-NW orientation is also related to the postorogenic emplacement of the alkaline Crevier Intrusion (ACI). The area is characterized by prograde regional metamorphism from the upper amphibolite facies to the granulite facies.

The area has several mineralized prospective zones for mineral exploration:

1) REE ± Th mineralization in granitic dykes, syenitic and granitic alkali feldspar intrusive rocks and carbonatites;

2) Nb-Ta mineralization in alkaline intrusions and carbonatites;

3) Fe-Ti ± P ± V mineralization in gabbronorites and nelsonites;

4) REE and P mineralization in ultramafic and syenitic rocks;

5) Ni-Cu mineralization in mafic and ultramafic rocks.

9:40 a.m.

Tectonic involvement of a strike-slip shear zone during the Grenvillian Orogen (Saguenay-Lac-Saint-Jean, Québec)

Conference details

Authors: Ève Gosselin (INRS-ETE), Renaud Soucy La Roche (INRS-ETE), Abdelali Moukhsil (MERN), Kyle Larson (UBC), Joshua Davies (UQÀM), Morgann Perrot (McGill)

10:00 a.m.

New geological model for the Grenville Province

Conference details

Author: Félix Gervais (PolyMTL)

10:20 a.m.

Spatial dispersion of niobium and rare earth mineralization in the Girardville carbonatite, a lead for mineral exploration

Conference details

Authors: Charles Saint-Laurent (UQÀC), Paul Bédard (UQÀC), Renée-Luce Simard (UQÀC), Abdelali Moukhsil (MERN)

10:40 a.m.

Geology of the Bellemare area, Grenville Province, Saguenay-Lac-Saint-Jean region

Conference details

Authors: Abdelali Moukhsil (MERN), Mhamed El Bourki (MERN)

11:00 a.m.

Geology of the Fourche Lake area, Grenville Province, Saguenay-Lac-Saint-Jean and Haute Mauricie regions.

Conference details

Authors: Francis Talla Takam (MERN), Abdelali Moukhsil (MERN)

11:20 a.m.

Geology of the Île-de-Grand-Calumet region, Grenville Province, Québec, Canada

Conference details

Author: Carl Bilodeau (MERN)